Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments
Incommensurate antiferromagnetism in a pure spin system via cooperative organization of local and itinerant moments
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DOI：
10.1073/pnas.1217292110
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发表时间：
2013-02-26
影响因子：
11.1
通讯作者：
Rosenbaum, T. F.
中科院分区：
文献类型：
--
作者：
Feng, Yejun;Wang, Jiyang;Rosenbaum, T. F.
具有强相关性的材料容易受到库仑、磁和晶格相互作用的驱动而产生自旋和电荷不稳定性。在具有显著的定域自旋和巡回自旋的材料中，哪种自旋将诱导有序并不明显。我们结合联合收割机的电输运，X射线磁衍射，和带结构计算的光电子能谱的研究，以表征连续的反铁磁转变在GdSi。GdSi具有相当大的局部矩和部分嵌套的费米表面，没有轨道效应的混淆贡献。我们确定了一条路线，以不相称的顺序，既不类型的时刻占主导地位，但植根于他们之间的合作反馈。巡游电子的嵌套费米表面在嵌套矢量处诱导局部矩之间的强相互作用，而有序的局部矩反过来为巡游电子之间形成自旋密度波提供必要的耦合。这种机制与电荷密度波材料中电子和离子之间的协同相互作用相呼应，并且应该与过渡金属和稀土金属间化合物的光谱密切相关。
Materials with strong correlations are prone to spin and charge instabilities, driven by Coulomb, magnetic, and lattice interactions. In materials that have significant localized and itinerant spins, it is not obvious which will induce order. We combine electrical transport, X-ray magnetic diffraction, and photoemission studies with band structure calculations to characterize successive anti-ferromagnetic transitions in GdSi. GdSi has both sizable local moments and a partially nested Fermi surface, without confounding contributions from orbital effects. We identify a route to incommensurate order where neither type of moment dominates, but is rooted in cooperative feedback between them. The nested Fermi surface of the itinerant electrons induces strong interactions between local moments at the nesting vector, whereas the ordered local moments in turn provide the necessary coupling for a spin-density wave to form among the itinerant electrons. This mechanism echoes the cooperative interactions between electrons and ions in charge-density-wave materials, and should be germane across a spectrum of transition-metal and rare-earth intermetallic compounds.